scholarly journals Characterization of Tensile Properties of Cola lepidota Fibers

Fibers ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 6
Author(s):  
Rémy Legrand Ndoumou ◽  
Damien Soulat ◽  
Ahmad Rashed Labanieh ◽  
Manuela Ferreira ◽  
Lucien Meva’a ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Cross Section ◽  
Fiber Bundle ◽  
Great Influence ◽  
Geographical Location ◽  
Plant Fibers ◽  
Hemp Fibers ◽  
Engineering Polymers

Plant fibers are being increasingly explored for their use in engineering polymers and composites, and many works have described their properties, especially for flax and hemp fibers. Nevertheless, the availability of plant fibers varies according to the geographical location on the planet. This study presents the first work on the mechanical properties of a tropical fiber extracted from the bast of Cola lepidota (CL) plant. After a debarking step, CL fibers were extracted manually by wet-retting. The tensile properties are first identified experimentally at the fibers scale, and the analysis of the results shows the great influence of the cross-section parameters (diameter, intrinsic porosities) on these properties. Tensile properties of CL fibers are also predicted by the impregnated fiber bundle test (IFBT). At this scale of bundles, a hackling step, which reduces shives and contributes to the parallelization of the fibers within bundles, improves tensile properties predicted by IFBT. The comparison with the properties of plant fibers given in the literature shows that CL fibers have tensile properties in the same range as kenaf, flax or hemp fibers.

Investigation of the Mechanical Behavior of Natural Vegetable Fibers Used in Composite Materials for Structural Strengthening

2021 ◽  
Vol 888 ◽  
pp. 15-21
Author(s):  
Ivelina Ivanova ◽  
Jules Assih ◽  
Dimitar Dontchev
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Fiber Composite ◽  
Low Cost ◽  
Weight Ratio ◽  
Synthetic Fiber ◽  
Engineering Structures ◽  
Hemp Fiber ◽  
Plant Fibers ◽  
Hemp Fibers

This research aims at studying the mechanical properties of industrial hemp fibers and promoting their use as a reinforcing composite material for strengthening of civil engineering structures. Natural hemp fibers are of great interest due to the following advantages they have: low cost, high strength-to-weight ratio, low density and non-corrosive properties. The use of plant fiber composite materials has increased significantly in recent years because of the negative reduction impact on the environment. For example, the tendency to use renewable resources and their possibility for recycling. They cause fewer health and environmental problems than synthetic fibers. Natural fibers, in addition to environmental aspects, have advantages such as low densities, i.e. have low weight, interesting mechanical properties comparable to those of synthetic fiber materials, and last but not least, low cost. Composites based on natural plant fibers can be used to reinforce or repair reinforced concrete structures, as shown by research on flax fiber composites. These concretes specimens strengthened with biocomposite materials have very good resistance to bending and significantly increase the rigidity of the structure. The results show that the hemp fiber reinforcement has significant effects on the strengthening and increase in flexural strength from 8% to 35 %.

scholarly journals Low-Voltage SEM of Natural Plant Fibers: Microstructure Properties (Surface and Cross-Section) and their Link to the Tensile Properties

2017 ◽  
Vol 200 ◽  
pp. 295-302 ◽  
Author(s):  
Sameer F. Hamad ◽  
Nicola Stehling ◽  
C. Holland ◽  
J.P. Foreman ◽  
C. Rodenburg
Keyword(s):  
Tensile Properties ◽  
Cross Section ◽  
Low Voltage ◽  
Plant Fibers ◽  
Natural Plant

Residual Stress Assessment in the Al2O3\Mullite Based Laminated System

2007 ◽  
Vol 333 ◽  
pp. 243-246
Author(s):  
Lorenzo Micele ◽  
Mylene Brach ◽  
Francis Chalvet ◽  
Goffredo de Portu ◽  
Giuseppe Pezzotti
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Cross Section ◽  
Laminate Composite ◽  
Spectroscopic Characterization ◽  
Gradual Change ◽  
Laminated Structure ◽  
Stress Assessment ◽  
Residual Stress State

To improve mechanical properties of mullite, a mullite-Al2O3\mullite laminate composite was prepared. Lamination generates residual stresses within the structure, measured by piezospectroscopy. A preliminary and complete piezo-spectroscopic characterization of the Al2O3\mullite system was carried out. A method to determine the concentration of Al2O3 in the composite by Raman spectrum was proposed and used to assess the composition of the laminated structure along the cross section. The experimental results evidenced a gradual change of composition and residual stress state between the two layer.

Multi-scale characterization of the effect of saturated steam on the macroscale properties and surface changes of moso bamboo

2021 ◽  
Vol 11 (5) ◽  
pp. 740-748
Author(s):  
Tiancheng Yuan ◽  
Jie Liu ◽  
Shouheng Hu ◽  
Xinzhou Wang ◽  
Xianmiao Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Great Influence ◽  
Modulus Of Rupture ◽  
Saturated Steam ◽  
Vascular Bundles ◽  
Multi Scale ◽  
Light Yellow ◽  
Scale Characterization

Bamboo is a woody material that has become a key substitute for wood resources in many fields. This study is aimed to analyze the effects of saturated steam (140, 160, 180 °C) on physical, crystallinity, chemical composition, mechanical properties as well as microstructures at different periods (4, 6, 8, 10 min). Expectedly, a reduction of hemicellulose and cellulose and increment of relative content of lignin in bamboo when temperature above 160 °C was positive to reduce the equilibrium moisture content (EMC). Thus, the hygroscopicity improved and the parenchyma cells and vascular bundles were shrunk slightly. Both temperature and time positively affected the crystallinity of bamboo samples in comparison with the control. Heat treatment parameters affect the mechanical properties of bamboo. When the treatment was carried out at 140 °C, the modulus of rupture (MOR) and modulus of elastic (MOE) increased in comparison to no treatment; Furthermore, The MOR and MOE decreased by 40% and 19% compared with that of the untreated bamboo at 180 °C for 10 min. The temperature and time had a great influence on a*, b*, and L* of the bamboo. The results showed that during the heat treatment, the bamboo color changed from light yellow to dark red-brown, and the overall color changed evenly. Among them, a* increased firstly and then decreased, indicating that the treated bamboo was reddish, while b* and L* mainly showed a downward trend. The ΔE value positively corresponded to heat treatment severity.

Chemical Treatment and Characterization of Fiber of Babassu Coconut Epicarp (Orbignya phalerata) for Application in Polymeric Composite

2016 ◽  
Vol 869 ◽  
pp. 233-236
Author(s):  
Carlos Alberto Lopes Fonteles ◽  
Gustavo Figueiredo Brito ◽  
José Francisco Reis Sobrinho ◽  
Tatianny Soares Alves ◽  
Renata Barbosa
Keyword(s):  
Mechanical Properties ◽  
Polymer Composites ◽  
Alkali Treatment ◽  
Low Cost ◽  
Implementation Process ◽  
Fiber Surface ◽  
Polymeric Composite ◽  
Plant Fibers ◽  
Polymeric Matrices

This set of mechanical properties of plant fibers allows its use as a reinforcement element in polymeric matrices and composites can be used in various sectors, and thus expanding the scope of use and the aggregate value of plant fibers. In this work, the choice by the use of alkali process to make the treatment of epicarp babassu fibers was decided in view of that it provides an effective, simple and low cost implementation process and also for being the most widely used method for modifying the surface of the fiber forming polymer composites. By SEM, it was observed the removal of wax layers, the impurities on the fiber surface and tyloses. With alkali treatment, it was also possible to notice the narrowing and closing of craters due to the packaging of denser material.

The Effect of Cryogenic Treatment on the Microstructure and Properties of Ti-6Al-4V Titanium Alloy

2013 ◽  
Vol 747-748 ◽  
pp. 899-903 ◽  
Author(s):  
Kai Xuan Gu ◽  
Zhi Qiang Li ◽  
Jun Jie Wang ◽  
Yuan Zhou ◽  
Hong Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Electron Microscope ◽  
Low Temperature ◽  
Fracture Surface ◽  
Cross Section ◽  
Cryogenic Treatment ◽  
Great Influence ◽  
Microstructure And Properties ◽  
Scanning Electron

The effect of cryogenic treatment on the microstructure and properties of Ti-6Al-4V has been studied in this paper. The program controlled SLX cryogenic box was used to conduct the cryogenic treatment and the subsequent low temperature temper. The scanning electron microscope was used to study the morphology of microstructure and fracture surface. As the results show that the cryogenic treatment increases the elongation of Ti-6Al-4V from 16.5 percent to 24.5 percent, at the same time, the strength increases slightly, this indicates that cryogenic treatment can improve the comprehensive mechanical properties. The microstructure measurement revealed that there is a tendency of reduction in the precipitated particles after cryogenic treatment. The cross section is flat and the size of dimples is more uniform. It is concluded that the change in the precipitation particle had a great influence in the mechanical properties.

scholarly journals Design Of An Optofluidic Device For The Measurement Of The Elastic Modulus Of Deformable Particles

2019 ◽  
Vol 215 ◽  
pp. 14003
Author(s):  
Massimiliano M. Villone ◽  
Janine K. Nunes ◽  
Howard A. Stone ◽  
Pier Luca Maffettone
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Real Time ◽  
Cross Section ◽  
Microfluidic Channel ◽  
Immiscible Liquids ◽  
Non Invasive ◽  
Deformable Particles ◽  
Soft Particles

Suspensions carrying deformable inclusions are ubiquitous in nature and applications. Hence, high-throughput characterization of the mechanical properties of soft particles is of great interest. Recently, a non-invasive optofluidic technique has been developed for the measurement of the interfacial tension between two immiscible liquids [8]. We have adapted such technique to the case of soft solid beads, thus designing a non-invasive optofluidic device for the measurement of the mechanical properties of deformable particles from real-time optical imaging of their deformation. The device consists of a cylindrical microfluidic channel with a cross-section reduction in which we make initially spherical soft beads flow suspended in a Newtonian carrier. By imaging the deformation of a particle in real time while it goes through the constriction, it is possible to get a measure of its elastic modulus through a theoretically derived-correlation. We provide both experimental and numerical validation of our device.

Preparation and Characterization of TPU Toughened PLA Elastic Fibers

2014 ◽  
Vol 789 ◽  
pp. 117-121 ◽  
Author(s):  
Shi Chao Wang ◽  
Heng Xue Xiang ◽  
Xiao Shuang Wen ◽  
Zhe Zhou ◽  
Mei Fang Zhu
Keyword(s):  
Mechanical Properties ◽  
Cross Section ◽  
Melt Spinning ◽  
Thermoplastic Polyurethane ◽  
Strong Interactions ◽  
Poly Lactic Acid ◽  
Elastic Fibers ◽  
Elongation At Break ◽  
Thermal Stability Of

Poly (lactic acid) (PLA) elastic fibers were prepared by melt spinning using Thermoplastic polyurethane (TPU) as a toughing agent and PLA-g-MA(Maleic anhydride) as a compatibilizer. Thermal properties and thermal stability of PLA/TPU composites, as well as the cross section morphology and mechanical properties of fibers were studied in the present investigation. DSC results showed that PLA was immiscible with TPU. In addition, the incorporation of TPU decreased the melting enthalpy of PLA/TPU composites. TG results indicated that the initial degradation temperatures of composites were also decreased by the appearance of TPU, and it decreased by 9°Cwhen TPU content was up to 20wt%. FESEM results confirmed that strong interactions were existed between PLA and TPU phases, which were benefit for the improvement of PLA/TPU fibers’ mechanical properties. Results of tensile testing demonstrated that TPU could improve the toughness of fibers effectively and the elongation-at-break of fibers increased from 2.2% of PLA to 203.9% of PLA/TPU.

scholarly journals Effect of Friction Stir Welding Parameters on the Microstructure and Mechanical Properties of AA2024-T4 Aluminum Alloy

2018 ◽  
Vol 8 (1) ◽  
pp. 2493-2498 ◽  
Author(s):  
A. W. El-Morsy ◽  
M. Ghanem ◽  
H. Bahaitham
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Cross Section ◽  
High Performance ◽  
Traverse Speed ◽  
Butt Joint ◽  
Welding Parameters ◽  
Friction Stir

In this work, the effects of rotational and traverse speeds on the 1.5 mm butt joint performance of friction stir welded 2024-T4 aluminum alloy sheets have been investigated. Five rotational speeds ranging from 560 to 1800 rpm and five traverse speeds ranging from 11 to 45 mm/min have been employed. The characterization of microstructure and the mechanical properties (tensile, microhardness, and bending) of the welded sheets have been studied. The results reveal that by varying the welding parameters, almost sound joints and high performance welded joints can be successfully produced at the rotational speeds of 900 rpm and 700 rpm and the traverse speed of 35 mm/min. The maximum welding performance of joints is found to be 86.3% with 900 rpm rotational speed and 35 mm/min traverse speed. The microhardness values along the cross-section of the joints show a dramatic drop in the stir zone where the lowest value reached is about 63% of the base metal due to the softening of the welded zone caused by the heat input during joining.

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